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TYING your shoelaces and throwing a baseball don’t sound like very remarkable achievements—unless you do them with somebody else’s hand. One year after a 37-year-old man had his missing left hand replaced with that of a donor who died aged 58, he can now use it to throw a ball or write a letter. That’s largely due to the carefully judged combination of anti-rejection drugs he received, a team of surgeons based at the University of Louisville School of Medicine in Kentucky reports in The New England Journal of Medicine (vol 343,